Mechanical stoker



Dee.'12, 1933. I F. w. LEHNERT 1,938,342

'MECHANICAL STOKER Filed April 30, 1932 (Mmmm Patented Dec. 12, 1933l A 4UNITED STATES PATENT ori-flea MECHANICAL s'roKER Friedrich W. Lehnert, New lhaven, Conn.. Application A51-irse, 1932. serial No. 608,484

-z Cnam.A (015110-451 arms 26 and forced inward onto the bed of'. coals This invention relates to animprovement in mechanical stakers, that devices for feeding fuel vto a furnace and removing the ashes therefrom. r Mechanically-stoked furnaces use very fine coal and this coal will form lumps or clinkers which, if allowed-to -pass into the ash-remover, will tend toiclog it. The object of this invention is to provide means for turning the lumps r clinkers back onto the fire.

A further 4object of the invention is to provide for a betterdistribution of heat from the re, and the invention consists in the construction as hereinafter described and particularly recitedin the In the accompanying drawing:

Fig. 1 is a sideview partly in section of a mechanical' stoker constructed in accordance with my invention;

Fig. 2 is a plan view ofthe lire pot showing my guards connected with the shell, the furnace casing being in section;

Fig. 3 is a vertical sectional view, and also 'showing my improved baille;

Fig. 4 is a perspective view of theguard-plates,

detached;

Fig. 5 is a perspective view of my improved attachment for bathe-plates; and

Fig. 6 is a perspective view illustrating a baille-- plate provided with my distributing-tubes.

In carrying out my invention, I.l employ the .usual furnace-casing 10 in which a shell 11 is mounted on bearings 12, and these bearings are preferably provided with balls 13. This shell is adapted to be-revolved.

Within the shell is the usual fire pot 14 communicating through a passage 15` with a hopper 16 in which coal is placed, and which is moved into the bottom of the hopper by a worm-screw 0n the shell is an outwardly-projecting' arm' 21, which carries ashes onto a screw 22 which conducts them to Aan ashreceiver.

My improvement consists of two segmental guards 23 and 24 which are mounted upon brack-i ets 25 carried bythe shell, and so that the guards revolve with the shell. These guards are adjacent to and extendabove -the uppei' end of the shell and preferably are of such a length that a space is formed between them, and the forward ends of the guards' with reference to the direc-tion of rotation are bent outward to form arms 26, and so that as the guards revolve with the shell, iine ashes may escape between the ends of the guards or between the guards and the upper edge of the in the re pot, to be disintegrated.

Furnaces of this character are usually provided with a baleplate 27 suspended above the 'fire box and, to, distribute the heat, I provide tube 30, through which tubes the heat passes and is generally deilected thereby.

This ring is provided'for installation in furnaces already installed, but instead of forming the ring separate from the baille-plate the bailleplate may be formed of larger diameter, corresponding to the diameter of the ring 28, as shown in Fig. 6, and the outer edge of this enlarged baille-plate will be formed with openings 31 over which tubes 32 will be arranged, these tubes, corresponding to the tubes 30, above referred to.A

These guard-plates can be readily produced and attached to shells already installed without of said shell, the guards servingto maintain clinkers and large particles of unconsum'ed fuel or' coke upon 'the me bed for further consump Y tion.

shell surrounding said nre pot, means for rotating said she1l, circumferentially-spaced segmental guards secured to said shell and extending from a point below toa. substantial distance above the top of the nre pot, the forward end 'of each guard withreference to the direction of rotation being curved outwardly, whereby upon rotation oi' said shell, ne particles of ash may pass between said guards, the curved portions serving to force large chunks of coal and ash back onto Vthe fire bed.

FRIEDRICK W. LEHN'ERT.

. .10o 2. A mechanical stoker comprising a iire pot, a y 

